| Résumé | A visco plastic constitutive model for polycrystalline ice is developed using the results of set of laboratory cyclic tests. The equations of the model were developed on the basis of a modified version of the classical theory of plasticity. The effect time and temperature on the mechanical plastic behaviour of ice were included.The model does not have a yield surface or a yield criterion; it uses a non-associative plastic potential function to formulate the plastic-stress strain behaviour of the ice. The model describes the behaviour of ice subjected to any loading path, including cyclic loading conditions. The model formulation accounts for the material non-linearity, time and temperature dependency, plasticity, material anisotropy, and hysterisis behaviour of ice when subjected to cyclic loading.An evaluation of the model was conducted to verify the capability of the model to predict the observed behaviour of ice. The model predictions of cyclic test results were in good agreement with the experimental measurements. The cyclic hysterisis stress-strain loops, and accumulated permanent strains were predicted very well. |
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